SOLUTION: How many whole rectangular firebricks measuring 9"x4.5" will fit on the floor of a 38" diameter round firepit? Voids left by the firebricks just inside of the perimeter of the cir
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Question 1138613: How many whole rectangular firebricks measuring 9"x4.5" will fit on the floor of a 38" diameter round firepit? Voids left by the firebricks just inside of the perimeter of the circle are acceptable; no bricks will be cut. Thanks! Answer by ikleyn(52788) (Show Source):
I do not think that this problem assumes getting precisely correct number of firebricks.
I think that obtaining a reasonable estimation is totally enough.
To get the estimation, take the area of the circle and divide it by the area of one single firebrick.
The area of the circle is = = = 1133.54 square inches.
The area of the firebrick is 9*4.5 = 40.5 square inches.
So the answer (the final estimation) is N = = ~ 28 firebricks. ANSWER
Another, more conservative estimation is to increase the radius of the circle by half the diagonal of the firebrick
and re-estimate with this new data.
By knowing the idea, you can make all necessary calculations on your own.
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